WE HAVE A TOW TRUCK A NISSAN 1800 B WITH A BAD VIBRATION YOU CAN SIT THERE IN NEUTRAL AND REV IT UP AND IT WILL START TO VIBRATE AT AROUND 2000 RPMS WE TOOK THE TRANIE OUT AND CHECKED THE FYWHEEL AND CLUTCH ASSM. WE ARE IN THE PROCESS OF CHANGING THE HARMONIC ... Login to read more.